You seem to have a misunderstanding about what an undergrad CS degree is about. It's not vocational training. If you want that, you can probably find something

You seem to have a misunderstanding about what an undergrad CS degree is about. It's not vocational training. If you want that, you can probably find something better at a community college. If you want to "build things that people actually use," do it. No one's stopping you, and there's not a college major for that - you just do it. Most bright CS majors learn programming on their own time. Completing a CS degree will give you skills and knowledge that will help with your goal but building web apps is not the focus and it's not supposed to be.